Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 1516-1535 of 3813
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Galactic cosmic rays in the outer heliosphere: theory and models
(Springer, 2011)We review recent advances in the field of galactic cosmic ray transport in the distant heliosphere. The advent of globalMHD models brought about a better understanding of the three-dimensional structure of the interface ... -
Games for learning in accountancy education: a systematic literature review
(The Social Sciences Research Society, 2017)Background: Games for learning (educational games) are viewed as instructional strategies requiring students to engage in competitive activities with predetermined rules and conditions. Various studies propose beneficial ... -
Gamma-gamma absorption in gamma-ray burst environments
(HEASA, 2016)Gamma-ray bursts (GRBs) are the most violent explosions in the universe, seen primarily as bright, short flashes of g-rays. Long GRBs are most likely associated with the violent death of a very massive star. They are ... -
Gamma-gamma absorption in the broad line region radiation fields of gamma-ray blazars
(IOP Publishing, 2016)The expected level of γγ absorption in the Broad Line Region (BLR) radiation field of γ-ray loud Flat Spectrum Radio Quasars (FSRQs) is evaluated as a function of the location of the γ-ray emission region. This is done ... -
Gamma-gamma absorption in the broad line region radiation fields of gamma-ray blazars. ERRATUM. (2016, ApJ, 821, 102)
(IOP Publishing, 2018)In the published article, our code to evaluate the γγ opacity due to the BLR radiation field contained a numerical error, due to which all opacities are a factor of 2π too low. The corrected Figures 2-4 are shown below. ... -
Gamma-gamma absorption in the γ-ray binary system PSR B1259-63/LS 2883
(IOP, 2017)The observed TeV light curve from the γ-ray binary PSR B1259-63/LS 2883 shows a decrease in the flux at periastron that has not been fully explained by emission mechanisms alone. This observed decrease can, however, be ... -
Gamma-ray and radio properties of six pulsars detected by the fermi large area telescope
(Institution of Physics (IOP), 2010) -
Gamma-ray blazar spectra with H.E.S.S. II mono analysis: the case of PKS 2155-304 and PG 1553+113
(EDP Sciences, 2017)Context. The addition of a 28 m Cherenkov telescope (CT5) to the H.E.S.S. array extended the experiment’s sensitivityto lower energies. The lowest energy threshold is obtained using monoscopic analysis of data taken with ... -
Gamma-Ray emission from the shell of supernova remnant W44 revealed by the Fermi LAT
(HighWire Press, 2010) -
Gamma-ray observational properties of TeV-detected blazars
(IOP Science, 2013)The synergy between the Fermi-LAT and ground-based Cherenkov telescope arrays gives us the opportunity for the first time to characterize the high-energy emission from blazars over 5 decades in energy, from 100 MeV to 10 ... -
Garden ecosystem services of Sub-Saharan Africa and the role of health clinic gardens as social-ecological systems
(Elsevier, 2018)Rapid urbanization is predicted to take place in Africa in the near future and currently stressed cities will be even more overburdened in terms of pressure on green areas and increasing urban poverty. Effectively planning ... -
Gas chemical adsorption characterization of lanthanide hexafluoroacetylacetonates
(SpringerSpringer, 2017)Newly-established adsorption enthalpy and entropy values of 12 lanthanide hexafluoroacetylacetonates, denoted Ln[hfac]4, along with the experimental and theoretical methodology used to obtain these values, are presented ... -
Gas chromatography-mass spectrometry profiles of urinary organic acids in healthy captive cheetahs ( Acinonyx jubatus )
(Elsevier, 2017)In captivity, cheetahs (Acinonyx jubatus) frequently suffer from several unusual chronic diseases that rarely occur in their free-ranging counterparts. In order to develop a better understanding of their metabolism and ... -
Gas crossover mitigation in PEM water electrolysis: hydrogen cross-over benchmark study of 3M's Ir-NSTF based electrolysis catalyst-coated membranes
(ECS, 2016)In this work we present some preliminary data, such as permeability (gas crossover) of oxygen and hydrogen as a function of current density and other operational variables, aimed at establishing baselines for unmitigated ... -
GC-MS-based urinary organic acid profiling reveals multiple dysregulated metabolic pathways following experimental acute alcohol consumption
(Nature, 2018)Metabolomics studies of diseases associated with chronic alcohol consumption provide compelling evidence of several perturbed metabolic pathways. Moreover, the holistic approach of such studies gives insights into the ... -
Gemini observations of galaxies in rich early environments (GOGREEN) I: survey description
(Oxford Univ Press, 2017)We describe a new Large Program in progress on the Gemini North and South telescopes: Gemini Observations of Galaxies in Rich Early Environments (GOGREEN). This is an imaging and deep spectroscopic survey of 21 galaxy ... -
Gender differences related to the health and lifestyle patterns of university students
(AOSIS [OpenJournals Publishing/ © 2009. The Authors. Licensee: OpenJournals Publishing. This work is licensed under the Creative Commons Attrib], 2013)One of the transitions from adolescence to adulthood is the admission of students to a university setting. Accompanying this transition is a new-found independence which results in university students having more autonomy ... -
Gender effects on self-regulation among university students
(Taylor & Francis, 2012)The aim of this study was to explore the relation between self-regulation, psychopathology and gender amongst a group of South African university students (N=384). Self-regulation was measured with the Shortened Self-Regulation ... -
Gender-based yoga for conflict resolution
(The Social Sciences Research Society, 2016)Organisations are taking proactive measures to manage conflict and intra-level competition through employee wellness programmes, emphasizing the use of yoga for developing harmonious relationships and positive behavioural ... -
Gene-environment and gene-gene interactions of specific MTHFR, MTR and CBS gene variants in relation to homocysteine in a black South Africans
(Elsevier, 2013)The methylenetetrahydrofolate reductase (MTHFR), cystathione-β-synthase (CBS) and methionine synthase (MTR) genes interact with each other and the environment. These interactions could influence homocysteine (Hcy) and ...
